Recovering the description of a card that has been changed

If someone changes the description of a card, it may appear that the entire description has been deleted. However, Trello tracks these changes in the background so you can recover the original description later. Although the old description isn't currently visible via the Trello web interface, the data is available via the API and it's relatively easy to locate.

Additional Technical Explanation

For example, let's say we want to view the old descriptions of one of the cards on the development board, https://trello.com/c/hpAcP7IS/814-multiple-log-in-credentials. The description has changed several times and we want to see what is used to be. Take note of the card's ID in the URL, which is hpAcP7IS.

The API route we want to use is GET /1/cards/[card id or shortlink]/actions, adding ?filter=updateCard:desc to the end so we only see changes to the description. Because this is a GET route, all you need to do is log into Trello in your browser and put the URL in the address bar.